I was doing some research and came across a couple articles about various estrogen inhibitors. In the articles it stated that Formestane will decrease the progesterone receptors. Unfortunately, formestane is not the easiest anti e to get. You also have to shoot it, as opposed to take a pill like Arimidex. Since everyone is always looking for something to stop progesterone, I thought you guys would like to know.
Also Nolvadex is a weak blocker of progesterone receptors. It will do it, but it's not very strong. I suspect if you combine winstrol with nolvadex you will be fine as evidenced by my own experience and those of my clients.